On average, listings lease in the $30's per square foot per year. The Rockville Centre region is going through a an increase in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 4% rise in rent.
In the last 90 days, 2 listings have been made available, which means listings might be leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 850 sqft. Most buildings in this area are close to 2 stories. Most buildings in this region were built in 1972 and are Class B.